We have been working to develop a low cost, three-electrode potentiostat for use in science education and environmental monitoring. This is a computer driven instrument that is appropriate for teaching at the university (undergraduate) or perhaps high school or home school level. It can be used to teach physical chemistry concepts and can be used to quantify things like metals in water. At this page, we describe using the instrument to measure lead in water at concentrations as low as 44 ppb.
The instrument (called the WheeStat) is comprised of a Stellaris / Tiva LaunchPad, a booster pack